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<?php
require_once dirname( __FILE__ ) . '/interface.jetpack-sync-codec.php';
/**
* An implementation of iJetpack_Sync_Codec that uses gzip's DEFLATE
* algorithm to compress objects serialized using json_encode
*/
class Jetpack_Sync_JSON_Deflate_Array_Codec implements iJetpack_Sync_Codec {
const CODEC_NAME = "deflate-json-array";
public function name() {
return self::CODEC_NAME;
}
public function encode( $object ) {
return base64_encode( gzdeflate( $this->json_serialize( $object ) ) );
}
public function decode( $input ) {
return $this->json_unserialize( gzinflate( base64_decode( $input ) ) );
}
// @see https://gist.github.com/muhqu/820694
protected function json_serialize( $any ) {
if ( function_exists( 'jetpack_json_wrap' ) ) {
return wp_json_encode( jetpack_json_wrap( $any ) );
}
// This prevents fatal error when updating pre 6.0 via the cli command
return wp_json_encode( $this->json_wrap( $any ) );
}
protected function json_unserialize( $str ) {
return $this->json_unwrap( json_decode( $str, true ) );
}
private function json_wrap( &$any, $seen_nodes = array() ) {
if ( is_object( $any ) ) {
$input = get_object_vars( $any );
$input['__o'] = 1;
} else {
$input = &$any;
}
if ( is_array( $input ) ) {
$seen_nodes[] = &$any;
$return = array();
foreach ( $input as $k => &$v ) {
if ( ( is_array( $v ) || is_object( $v ) ) ) {
if ( in_array( $v, $seen_nodes, true ) ) {
continue;
}
$return[ $k ] = $this->json_wrap( $v, $seen_nodes );
} else {
$return[ $k ] = $v;
}
}
return $return;
}
return $any;
}
private function json_unwrap( $any ) {
if ( is_array( $any ) ) {
foreach ( $any as $k => $v ) {
if ( '__o' === $k ) {
continue;
}
$any[ $k ] = $this->json_unwrap( $v );
}
if ( isset( $any['__o'] ) ) {
unset( $any['__o'] );
$any = (object) $any;
}
}
return $any;
}
}
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